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    Get ready for the era of hypersonic flight — at five times the speed of sound

    by Samantha Masunaga, Los Angeles Times Mar 05, 2018 6 minutes

    The sleek aircraft, really more rocket than plane, dropped from the wing of a B-52 before shooting through the sky above Point Mugu Sea Range off the California coast, leaving a long, white contrail in its wake.

    The unmanned X-51A hit Mach 4.8, almost five times the speed of sound, with help from a solid rocket booster. Then the Boeing Co. aircraft jettisoned the booster and its experimental scramjet engine took over, sucking in highly compressed air to propel the vehicle even faster - to a hypersonic speed of about 3,400 mph, or Mach 5.1.

    The aircraft relied on that scramjet for only 3 1/2 minutes during the 2013 test flight, but researchers say reliable technology that propels aircraft to hypersonic speeds of Mach 5 or higher could be functional within 10 years, initially for use in missiles.

    The stakes are high.

    The Pentagon sees hypersonic weaponry as a potential game changer that could give it - or an opponent - the kind of edge that stealth aircraft or smart bombs

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